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H1 subtype expression during cell proliferation and growth arrest.

机译:H1亚型表达在细胞增殖和生长骤停期间。

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H1 histone subtype genes differ in their expression patterns during the different stages of the cell cycle interphase. While the group of replication-dependent H1 histone subtypes is synthesized during S phase, the replacement histone subtype H1.0 is also expressed replication-independently in non-proliferating cells. The present study is the first report about the analysis of the cell cycle-dependent expression of all five replication-dependent H1 subtypes, the replacement histone H1.0 and the ubiquitously expressed subtype H1x. The expression of these H1 histone subtypes in HeLa cells was analyzed on mRNA level by quantitative real-time RT-PCR as well as on protein level by immunoblotting. We found that after arrest of HeLa cells in G(1) phase by treatment with sodium butyrate, the mRNA levels of all replication-dependently expressed H1 subtypes decreased, but to very different extent. During S phase the individual replication-dependently expressed H1 subtypes show similar kinetics regarding their mRNA levels. However, the variations in their protein amounts partially differ from the respective RNA levels which especially applies to histone H1.3. In contrast, the mRNA as well as the protein level of H1x remained nearly unchanged in G(1) as well as during S phase progression. The results of the present study demonstrate that the cell cycle-dependent mRNA and protein expression of various H1 subtypes is differentially regulated, supporting the hypothesis of a functional heterogeneity.
机译:H1组蛋白亚型基因在细胞周期间相互作用的不同阶段的表达模式中不同。虽然在S相期间合成了复制依赖性H1组蛋白亚型,但替代组蛋白亚型H1.0也在非增殖细胞中独立地表达复制。本研究是关于分析所有五种复制依赖性H1亚型的细胞周期依赖性表达的第一个报告,替代组蛋白H1.0和普遍地表达亚型H1X。通过定量实时RT-PCR对MRNA细胞中的这些H1组蛋白亚型的表达在MRNA水平上以及通过免疫印迹蛋白质水平。我们发现,通过用丁酸钠处理G(1)相中的Hela细胞,所有复制依赖性表达的H1亚型的mRNA水平降低,但在不同程度上。在S期间,单独的复制依赖性表达的H1亚型显示出类似的动力学是其mRNA水平。然而,其蛋白质量的变化与特别适用于组蛋白H1.3的相应RNA水平不同。相反,MRNA以及H1x的蛋白质水平在G(1)以及在S期进展期间保持几乎不变。本研究结果表明,差异调节了各种H1亚型的细胞周期依赖性mRNA和蛋白质表达,支持功能异质性的假设。

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